What are some signs a guy is interested?

ragingumbreon
I have a friend who is a junior and he's been acting very touchy and friendly towards me in specific. I'm curious on some signs of interest from guys to see if anything could be happening. Some people have been telling him to stop flirting with me, but I'm not sure if he actually is. I have trouble picking up signals like that :( Thanks!!
What are some signs a guy is interested?
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